A. Sundararajan's Weblog

Debugging option for javac and javafxc

I work on JavaFX compiler these days. The command line (debugging) option that I often use is -doe ("dump on error"). This option prints stack trace of the compiler when error message is printed. NOTE: This is an internal option and can be removed any time without notice! But, it is useful for debugging. This option works for javac as well as javafxc. When I misspelled "class" as "clas" and run compiler with -doe option, I got the stack trace below:

$ javac -doe t.java
t.java:1: class, interface, or enum expected
clas t {}
^
java.lang.RuntimeException
	at com.sun.tools.javac.util.Log.writeDiagnostic(Log.java:565)
	at com.sun.tools.javac.util.Log.report(Log.java:523)
	at com.sun.tools.javac.util.Log.error(Log.java:404)
	at com.sun.tools.javac.parser.Parser.reportSyntaxError(Parser.java:282)
	at com.sun.tools.javac.parser.Parser.syntaxError(Parser.java:267)
	at com.sun.tools.javac.parser.Parser.classOrInterfaceOrEnumDeclaration(Parser.java:2206)
	at com.sun.tools.javac.parser.Parser.typeDeclaration(Parser.java:2180)
	at com.sun.tools.javac.parser.Parser.compilationUnit(Parser.java:2126)
	at com.sun.tools.javac.main.JavaCompiler.parse(JavaCompiler.java:509)
	at com.sun.tools.javac.main.JavaCompiler.parse(JavaCompiler.java:550)
	at com.sun.tools.javac.main.JavaCompiler.parseFiles(JavaCompiler.java:801)
	at com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:727)
	at com.sun.tools.javac.main.Main.compile(Main.java:353)
	at com.sun.tools.javac.main.Main.compile(Main.java:279)
	at com.sun.tools.javac.main.Main.compile(Main.java:270)
	at com.sun.tools.javac.Main.compile(Main.java:69)
	at com.sun.tools.javac.Main.main(Main.java:54)
1 error

( Dec 17 2008, 06:44:46 PM IST ) Permalink Comments [1] | | | | |